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Position-sensitive photodetector and light transmissive tablet and light-emitting pen

  • US 4,794,634 A
  • Filed: 08/13/1986
  • Issued: 12/27/1988
  • Est. Priority Date: 12/24/1985
  • Status: Expired due to Fees
First Claim
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1. A tablet type data input/output device comprising:

  • a tablet portion comprising a rectangular position-sensitive photodetector and a light transmissive planar display element disposed on said photodetector, said photodetector comprising a substrate, a first resistance layer disposed on said substrate, an amorphous semiconductor layer disposed on said first resistance layer, and a second resistance layer disposed on said amorphous semiconductor layer, said first resistance layer being provided at opposing edges thereof in a predetermined first direction with a pair of first electrodes each for taking out an output signal, said second resistance layer being provided at opposing edges thereof in a second direction perpendicular to said first direction with a pair of second electrodes each for taking out an output signal;

    a light emitting pen for irradiating a light spot onto said tablet portion so as to indicate a data input position;

    detecting means for detecting the data input position indicated by said light emitting pen based on the output signals taken out from said first and second electrodes;

    display control means for controlling display of said planar display element; and

    data transmitting means for transmitting output of said detecting means for subsequent processings.

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